ICD-10-CM > O00-O9A > O30-O48 > O35 > O35.0 > O35.03 O35.03 Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts Non-Billable/Non-Specific Codes O35.03X0..., not applicable or unspecifiedO35.03X1..., fetus 1O35.03X2..., fetus 2O35.03X3..., fetus 3O35.03X4..., fetus 4O35.03X5..., fetus 5O35.03X9..., other fetus